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The parallax method to determine distance is good for stars only within about 100 parasecs. Why not further?

April 26, 2017astrobiology Astronomy determine distance method parallax physical sciences

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The parallax method to determine distance is good for stars only within about 100 parasecs. Why not further?

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because of truncation errors the angle of sight can only be as accurate as the distance and orentation it is seen from if you don’t know what truncation errors are if you take PI (a run on number) and using a calculator make 5 calculations in a row without clearing the result.